var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
function encode64(input){
	 input = escape(input);
	 var output = "";
	 var chr1, chr2, chr3 = "";
	 var enc1, enc2, enc3, enc4 = "";
	 var i = 0;
	 do
	 {
	 chr1 = input.charCodeAt(i++);
	 chr2 = input.charCodeAt(i++);
	 chr3 = input.charCodeAt(i++);
	 enc1 = chr1 >> 2;
	 enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
	 enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
	 enc4 = chr3 & 63;
	 if (isNaN(chr2))
	 {
	 enc3 = enc4 = 64;
	 }
	 else if (isNaN(chr3))
	 {
	 enc4 = 64;
	 }
	 output = output +
	 keyStr.charAt(enc1) +
	 keyStr.charAt(enc2) +
	 keyStr.charAt(enc3) +
	 keyStr.charAt(enc4);
	 chr1 = chr2 = chr3 = "";
	 enc1 = enc2 = enc3 = enc4 = "";
	 } while (i < input.length);
	 return output;
}
function decode64(input){
	 var output = "";
	 var chr1, chr2, chr3 = "";
	 var enc1, enc2, enc3, enc4 = "";
	 var i = 0;
	 //	  remove all characters that are not A-Z, a-z, 0-9, +, /, or =
	 var base64test = /[^A-Za-z0-9\+\/\=]/g;
	 if (base64test.exec(input))
	 {
	 alert("There were invalid base64 characters in the input text.\n" +
	 "Valid base64 characters are A-Z, a-z, 0-9, '+', '/', and '='\n" +
	 "Expect errors in decoding.");
	 }
	 input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
	 do
	 {
	 enc1 = keyStr.indexOf(input.charAt(i++));
	 enc2 = keyStr.indexOf(input.charAt(i++));
	 enc3 = keyStr.indexOf(input.charAt(i++));
	 enc4 = keyStr.indexOf(input.charAt(i++));
	 chr1 = (enc1 << 2) | (enc2 >> 4);
	 chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
	 chr3 = ((enc3 & 3) << 6) | enc4;
	 output = output + String.fromCharCode(chr1);
	 if (enc3 != 64)
	 {
	 output = output + String.fromCharCode(chr2);
	 }
	 if (enc4 != 64)
	 {
	 output = output + String.fromCharCode(chr3);
	 }
	 chr1 = chr2 = chr3 = "";
	 enc1 = enc2 = enc3 = enc4 = "";
	 } while (i < input.length);
	 return unescape(output);
}